Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 0	$ 2,857
Receivables (less allowance for doubtful accounts: March 31, 2014 - $18; December 31, 2013 - $18)	31,871	27,821
Inventory	30,875	34,917
Prepaid expenses	2,035	848
Deferred income taxes	4,162	4,977
Refundable income taxes	258	466
Total current assets	69,201	71,886
Property and equipment	195,667	194,687
Less accumulated depreciation and amortization	(127,409)	(124,443)
Property and equipment, net	68,258	70,244
Equity method investments	10,458	7,123
Other assets	1,985	2,076
Total assets	149,902	151,329
Current Liabilities
Current maturities of long-term debt	1,570	1,557
Accounts payable	18,552	23,107
Accounts payable to affiliate, net	2,564	1,204
Accrued expenses	7,239	8,282
Total current liabilities	29,925	34,150
Long-term debt, less current maturities	3,214	3,611
Revolving credit facility	18,455	18,000
Deferred credit	3,770	3,925
Accrued retirement health and life insurance benefits	4,363	4,423
Other noncurrent liabilities	662	640
Deferred income taxes	4,162	4,977
Total liabilities	64,551	69,726
Commitments and Contingencies – (Note 4)
Capital stock
Preferred, 5% non-cumulative; $10 par value; authorized 1,000 shares; issued and outstanding 437 shares	4	4
Common stock
No par value; authorized 40,000,000 shares; issued 18,115,965 shares at March 31, 2014 and December 31, 2013, 17,717,186 and 17,750,421 shares outstanding at March 31, 2014 and December 31, 2013, respectively	6,715	6,715
Additional paid-in capital	8,758	8,728
Retained earnings	70,564	66,686
Accumulated other comprehensive loss, net of tax	(179)	(4)
Treasury stock, at cost
Shares of 398,779 and 365,544 at March 31, 2014 and December 31, 2013, respectively	(511)	(526)
Total stockholders’ equity	85,351	81,603
Total liabilities and stockholders’ equity	$ 149,902	$ 151,329